Basic audio editing

Rather than buy new ringtones, I send my own mp3's to my phone. In my PC days, I'd open the file in Windows Movie Maker to trim the track to the portion I want, save it as an mp3, and poof, I was done. i want to do the same now that I'm on OS X, but don't know what program to use. iMovie edited the file easily, but would only save as a move. GarageBand worked also, but would only save as a GarageBand file. Any other way to accomplish what I want? It needs to end up as an mp3 file.

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